Dual Cartridge Mechanical Seals

73P & 75P - Dual Stationary Back-to-Back Cartridge Seals

Dual cartridge seals are the answer for applications where a second level of protection is needed. Flexaseal’s Styles 73P & 75P offer system and personnel protection and are designed to ensure compliance with stringent environmental and emissions regulations.

• The Style 73P offers the advantages of an inboard stationary metal bellows design, while the Style 75P offers the efficiency and economy of springs isolated from the product
• Easy installation and low maintenance that can be operated in a pressurized or non-pressurized state
• Both the 73P & 75P can fit pumps with standard and enlarged bores without modification
• Flexaseal has replaced traditional cup point set screws with stainless steel drive lugs, resulting in a five-fold improvement in torque transmission strength. And the possibility of sleeve distortion and damage due to over-tightened set screws is eliminated
• Both cartridge seal designs are hydraulically balanced

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	3600 FPM (18 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

78 - Heavy Duty Rotating Metal Bellows Cartridge Seal

For High Temperature and Dirty Critical Services Where Leakage Must be Completely Contained

The Flexaseal Style 78 tandem cartridge seal is specifically designed for ruggedness and durability to withstand higher temperature or dirty services were leakage and emissions must be completely contained. Design elements include retained faces to allow for pressurized or unpressurized barrier systems, rotating metal bellows for self-cleaning and pilot gland to positively center the seal.

Style 78 is available in a High Temperature (HT) design with static O-Rings or with Grafoil Packing. This allows for operating temperatures up to 800F, while improving reliability by eliminating the dynamic secondary sealing element.

The Style 78 cartridge seal is uniquely customizable to your specific application requirements. API 682 Compliant options are also available.

• Easy to install cartridge designs
• Incorporated pumping ring improves the movement – and the cooling effect – of the barrier fluid during operation
• A tangential connection maximizes the flow of barrier fluid
• Can be operated in pressurized or non-pressurized configurations
• Static O-rings throughout cartridge
• Self-cleaning bellows action
• Fits ANSI standard and big bore pumps
• Metric sizes are available
• Tandem design maintains product and barrier fluid on O.D. of both seals for increased safety and heat dissipation
• Hydraulically balanced design
• Double-ply bellows design available for higher pressure
• Shrouded face design for added protection
• Designs available include API 682 Type B low temperature and Type C high temperature as well as Tandem Arrangements 2 and 3

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	Inboard – 300 PSI (20 bar) Outboard – 250 PSI (17 bar)
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

79 - Heavy Duty Stationary Tandem Multi-Spring Cartridge Seal

For Critical Services Where Leakage Must be Completely Contained

The Flexaseal Style 79 tandem cartridge seal is specifically designed for ruggedness and durability to withstand services were leakage and emissions must be completely contained. Design elements include retained faces to allow for pressurized or unpressurized barrier systems, stationary design for maximum runout compensation and pilot gland to positively center the seal.

The Style 79 cartridge seal is uniquely customizable to your specific application requirements. API 682 Compliant options are also available.

• Incorporated pumping ring improves the movement – and the cooling effect – of the barrier fluid during operation
• Tandem design maintains product and barrier fluid on O.D. of both seals for increased safety and heat dissipation
• A tangential connection maximizes the flow of barrier fluid
• Can be operated in pressurized or non-pressurized state configurations
• Springs are located out of the product
• Double balanced inboard face allows for reverse pressures in upset conditions
• Easy to install cartridge design
• Fits ANSI standard and big bore pumps
• Metric sizes are available
• Can be easily adapted to satisfy high pressure applications or in cases of extreme run out
• Retained faces eliminate troublesome drive pins
• Hydraulically balanced design
• API 682 Type A Tandem Arrangement 2 and 3 available

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	1,200 PSI
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

80A - Heavy Duty Rotating Multi-Spring Tandem Cartridge Seal

For API 682 Applications

The Flexaseal Style 80A is designed specifically to conform to API 682 Category 2 Applications for Midstream and Downstream Oil and Gas Applications where a Pressurized or Unpressurized Tandem Arrangement is Desired.

• Oversized Monolithic Seal Faces for superior heat dissipation and durability
• Tang Drive System for reliable face torque transfer and reduced O-Ring hang up
• Heavy Duty Springs to mitigate process debris clogging and reduce spring quantity
• Cushion Mounted Primary Seat to increase reliability in harsh services
• Retained Seal Faces for pressurized or unpressurized barrier systems
• Optimized Pumping Ring for higher barrier fluid flow and better seal cooling

Flush Plans 11/52/53A/53B/54

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	450 PSIG
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

90A - Heavy Duty Rotating Multi-Spring Dual Cartridge Seal

For API 682 Applications

The Flexaseal Style 90A is designed specifically to conform to API 682 Category 2 Applications for Midstream and Downstream Oil and Gas Applications where a Pressurized Dual Arrangement is Desired.

• Oversized Monolithic Seal Faces for superior heat dissipation and durability
• Tang Drive System for reliable face torque transfer and reduced O-Ring hang up
• Heavy Duty Springs to mitigate process debris clogging and reduce spring quantity
• Cushion Mounted Primary Seat to increase reliability in harsh services
• Retained Seal Faces for pressurized barrier systems
• Optimized Pumping Ring for higher barrier fluid flow and better seal cooling
• OD Pressure Design for enhanced solids handling, barrier fluid distribution and seal reliability

Flush Plans 11/53A/53B/54

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	450 PSIG
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

FCS – Dry Running Secondary Containment Seal

Designed for Safe Fluid Containment & Environmental Emission Control

In certain processes, dangerous and volatile fluids require additional precautions to protect personnel, ensure safe operation, and prevent downtime. The Flexaseal Multi-Spring Fluid Containment (FCS) Seal has been specifically designed as an economical option for applications where the highest level of safety and environmental control is necessary. The FCS Seal allows monitoring of any primary seal leakage and functions as a secondary containment seal in the event of any primary failure.

The FCS Seal is a contacting, dry-running multi-spring pusher seal which can be added to most of Flexaseal’s single cartridge options, including:

• Style 58 heavy duty API stationary multi-spring cartridge seal
• Style 53A API rotating welded metal bellows cartridge seal
• Style SMS stationary multi-spring cartridge seal
• Style RB rotating welded metal bellows cartridge seal
•  
  • Lightly loaded seal face minimizes wear and face temperature
  • Extended seal face has long wear life
  • Balanced design minimizes heat generation and power consumption and guarantees stable operation under worst-case containment scenarios
  • Isolation bushing keeps normal inboard seal leakage away from the FCS seal
  • Dynamic drive ring prevents pin-wear hang up
  • Most commonly used with API 682 Plans 72, 75, and/or 76

Operating Conditions

Speed:	10000FPM (50 m/sec)
Temperature:	up to 550°F (288°C) using high temperature elastomers
Pressure:	Gas-lubricated: up to 10 psig (0.7barg). Liquid-lubricated: up to 300 psig (20.7 barg), dynamic. Liquid-lubricated: up to 600 psig (41.4 barg), static.

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.